combustion – n. technical a chemical reaction that results when oxygen combines with other substances to produce heat and usually light

battery – n. a device that is placed inside a machine (such as a car) to supply it with electricity

emission – n. the act of releasing something, often into the air

hydropower - n. electricity produced from machines that are run by moving water

renewable – adj. replaced by natural processes; able to be replaced by nature

ecosystem – n. the name for a community of organisms and its environment

customer – n. someone or something that purchases goods or services

diesel – n. a kind of fuel that is used in vehicles with diesel engines

alternative – n. something that can be chosen instead of something else; a choice

subsidize – v. to aid with public money
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